pipeline: remove unreachable branch
pipeline: remove unreachable branch

A previous change blamed it on compiler/ASan, while this is a real
(yet minor) issue.

This return -EINVAL is never reached since we test all combinations of
fidx and fcin booleans.
All branches end up with a return 0, factorize them.

Fixes: 84f5ac9418ea ("pipeline: fix build with ASan")
Fixes: f38913b7fb8e ("pipeline: add meter array to SWX")

Signed-off-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>
Acked-by: Cristian Dumitrescu <25468b8a3698eeb3c368247f8635924bb4a1ce2c@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk